通过可变层指数调节富勒烯的电子结构和分子有序
Tuning fulleride electronic structure and molecular ordering via variable layer index
摘要：
C_（60）富勒烯化合物是一种独特的柔性分子材料，具有多种多样的性质，包括体相化合物的超导性和磁性、薄膜中的电子相和取向相以及单C_（60）晶体管中的量子输运。富勒烯性质的复杂性源于许多竞争相互作用的存在，如电子-电子相关，电子-振动耦合和分子间跳跃。每个相互作用的确切作用是有争议的，因为在复杂的富勒烯材料中很难通过实验分离出单一相互作用的影响。在这里，我们报告了一个独特的控制水平的KxC 60超薄膜的材料特性，通过良好的控制原子层索引和准确的掺杂浓度。利用STM技术，我们观察到一系列的电子和结构的相变的富勒烯从二维单层发展到准三维多层膜的早期阶段的逐层生长。这些结果表明富勒烯电子结构和分子有序性与可变KxC 60膜层指数的系统演化，并为创造新的分子结构和器件提供了新的思路。
英文摘要：
C60 fullerides are uniquely flexible molecular materials that exhibit a rich variety of behavior, including superconductivity and magnetism in bulk compounds, novel electronic and orientational phases in thin films, and quantum transport in a single-C60 transistor. The complexity of fulleride properties stems from the existence of many competing interactions, such as electron-electron correlations, electron-vibration coupling, and intermolecular hopping. The exact role of each interaction is controversial due to the difficulty of experimentally isolating the effects of a single interaction in the intricate fulleride materials. Here we report a unique level of control of the material properties of KxC60 ultra-thin films through well-controlled atomic layer indexing and accurate doping concentrations. Using STM techniques, we observe a series of electronic and structural phase transitions as the fullerides evolve from two-dimensional monolayers to quasi-threedimensional multilayers in the early stages of layer-by-layer growth. These results demonstrate the systematic evolution of fulleride electronic structure and molecular ordering with variable KxC60 film layer index, and shed new light on creating novel molecular structures and devices.
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